Hyde Park, LondonAt best during their set at the Serpentine Sessions festival, Grizzly Bear's songs were cosmic reveries – at worst, self-indulgent musical doodles that seemed to go on for days, writes Ian Gittins

Snape Maltings, AldeburghPierre Boulez made a once-unthinkable appeareance at the Aldeburgh festival, following two astounding performances by Thomas Zehetmair and Pierre-Laurent Aimard, writes Andrew Clements